Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds genuine value by explaining that units_and_grams lists the usable units with their gram weights — useful shape information absent from the schema — but says nothing else about the response payload.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single front-loaded sentence plus the endpoint path — no filler. It is arguably too terse for a tool with no output schema, but nothing written is wasted.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a read-only two-parameter getter this is close to sufficient, and annotations cover safety. However, with no output schema, the description only hints at one returned field (units_and_grams) and leaves the rest of the ingredient-line payload undisclosed.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Both parameters are fully documented in the schema (100% coverage), including id types and constraints, so the schema carries the load. The description adds no extra meaning about the ids beyond echoing them in the URL template.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the resource precisely (one recipe ingredient line) and adds the GET path, making it unmistakable that this is a single-item fetch. The singular 'one ingredient line' implicitly contrasts with the plural list sibling, though it never names it.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no explicit when-to-use statement, no prerequisite (e.g., needing recipe_id from recipal_get_recipe), and no reference to alternatives such as recipal_list_recipe_ingredients or recipal_get_ingredient. The agent must infer usage entirely from the name and path.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.